The model is based on an \(SU(5)/SO(5)\)  coset space, where the EW gauge
group has been doubled to \(\left[SU(2)\times U(1)\right]^2 \rightarrow SU(2)_L\times U(1)_Y\)  in order to implement collective symmetry
breaking. T-parity renders the mixing angle 45 degrees. The
implementation of T parity in the fermion sector necessitates the
postulation of vector-like T-odd lepton and quark partners for all
generations as well as T-even and -odd top partners (\(T^\pm \) ). Besides
the symmetry breaking scale \(f\) , the model depends on the ratio of the
two Yukawa couplings in the top sector, \(R := \lambda _1/\lambda _2\) ,
and the Yukawa couplings of the heavy quark partners, \(\kappa _q\)  and
heavy lepton partners, \(\kappa _\ell \) . Furthermore, the model predicts
deviations of order \(v^2/f^2\)  of the SM charged and neutral current as
well as Higgs couplings from their SM values. This leads to bounds
from EWPO and Higgs measurements that together constrain \(f \gtrsim 694\)  GeV at 95% CL [1]}. In the section we will
discuss the limits from direct searches.
